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PPSA Member Case Studies

Definition of subsea pig launching and subsea pig receiving capability
By: Jee Ltd
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    Jee’s client was developing a number of fields in the Mediterranean Sea. As part of this development a new subsea pipeline was to be laid carrying produced gas from two separate wellsites to a tie-in to an existing larger diameter export pipeline. The pipeline system was being designed to accommodate pigging operations through the field life. These pigging operations would require pigs to be launched and received subsea, using diverless subsea pig traps.
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ILI project management
By: Jee Ltd
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    Jee undertook the technical management and campaign design of in-line inspections of two deep water, high pressure flowline loops from an FPSO in Angola. The campaign included inspections of clad pipe sections and flexible risers, and was the first time either pipeline had been pigged during operation.
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Isolation plug and ESDV assurance
By: Jee Ltd
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    BP asked Jee for support with the assurance of an emergency shutdown valve (ESDV) overhaul. The project proposed to use a remote isolation tool downstream of the ESDV, where it would be set with the aim of providing a safe isolation barrier to allow repair or replacement. BP operate the pipeline but a third-party operates the platform where the ESDV is located, who were responsible for the execution of the work. BP took an assurance role in the project with our support as an independent advisor.
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Pipeline cleaning sequencing for decommissioning
By: Jee Ltd
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    A major North Sea operator were planning the de-commissioning process for a number of interconnected fields, comprising of fixed platforms, subsea structures and both interfield and export pipelines and umbilicals. Jee was contracted to assess the options for flushing, pigging and conditioning of the pipeline infrastructure and to advise an optimised base case cleaning methodology to be taken forward to the detailed engineering phase.
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Sphering frequency review
By: Jee Ltd
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    Petrogas E&P Netherlands owns and operates interests in the A and B blocks in the Northern sector of the Dutch continental shelf. In 2015, Petrogas requested that we review the sphering strategy for one of the existing gas pipelines and a new gas pipeline soon to go into operation.

    Removal of liquids from gas pipelines is crucial for maintaining pipeline integrity. The liquids are a potential corrosion threat as well as having flow assurance implications if the quantity of liquid in the pipeline becomes excessive for handling at receipt. There is therefore a high importance on optimisation of sphering strategies for maintaining operability of pipeline systems whilst minimising the number of sphering operations required.

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PigLet Snuffles Out Pipe Problems
By: A. Hak Industrial Services B.V.
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    The inspection tool “Piglet” is based on ultrasonic technology. The inspection results are displayed directly on-screen via an unique developed glass fibre optic module. For standard steel, ultrasonic technology makes it possible to identify corrosion area’s and to determine accurately the remaining wall thickness.

    However in the water and waste water industry pipelines consists of other materials than steel. Normally PVC, HDPE, asbestos cement, cast iron and concrete lined steel pipes are used, which need another approach to determine its integrity. For these types of materials the degradation system is not fully known yet and other parameter than the remaining wall thickness could be important.

    A. Hak Industrial Services has started a trial and error approach. Together with the water and wastewater industry some critical pipeline types were identified and were inspected using the existing ultrasonic Piglet technology.

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Sakhalin II phase 2 onshore pipelines, precommissioning and commissioning
By: Weatherford Pipeline & Specialty Services
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    Weatherford P&SS have successfully completed the full precommissioning and start-up suite of activities on over 1,000 miles (1600km) of pipelines for Starstoi on the Sakhalin II phase 2 pipeline project. This was followed with full nitrogen commissioning works to bring oil and gas onto the environmentally sensitive Sakhalin Island. Utilising strong environmental procedures and controls to avoid any disruption to the key salmon spawning areas, the rare Steller Sea Eagle nesting areas and general bear population, all facets of the project were completed successfully whilst also overcoming the key engineering difficulties in this remote and rugged region.
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Bayu Undan pipeline and Darwin LNG project, precommissioning and commissioning
By: Weatherford Pipeline & Specialty Services
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    As part of the construction and commissioning of the Darwin liquefied natural gas (LNG) project, Weatherford’s Pipeline & Specialty Services (Weatherford P&SS) group performed several important operations, contributing to the successful startup of the ConocoPhillips LNG plant with 312.3 miles (502.6km) of 26-28 inch dual diameter pipeline and 188,000m3 LNG tank in Darwin, Australia.
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“wet-buckle” contingency services for dual 239 mile pipelines in 7,035 feet of water
By: Weatherford Pipeline & Specialty Services
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    During recent years, technology has allowed the exploitation of oil and gas reserves in increasingly deeper waters. In addition to floating production facilities and tanker transportation, pipeline construction companies have also developed their services to facilitate pipeline transportation of oil and gas reserves from deepwater installations. As a result, some construction companies have been required to obtain a real time solution for a “wet-buckle” scenario. In an ideal world, construction of offshore pipelines should be completed without any incidents. However, in the real world, and for a variety of reasons, sections of a pipeline can sometimes become damaged or even flooded during the laying process. Such an occurrence of unplanned flooding of the pipeline is known as “wet-buckling”. Since a pipeline is most likely to buckle during deepwater installation, it is important to have detection and correction methods in place at this stage. While few deepwater projects ultimately require a “wet-buckle” contingency during pipe lay, construction companies agree on the benefits of providing it as an insurance. If any buckling escapes detection during the installation, and is only discovered post installation, then the costs to correct the situation can be huge.
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“wet-buckle” contingency services for 32 inch 322 mile pipeline in 3,600 feet of water
By: Weatherford Pipeline & Specialty Services
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    The Trans-Mediterranean pipeline, known as the Libya Gas Transmission System (LGTS), or Greenstream, is 322 miles (518km) long, 32 inch diameter. The pipeline runs from Melitah, Libya, North Africa to Gela, Sicily, Italy (Fig. 1) and is located in water depths exceeding 3,600 feet (1,100m).

    In an ideal world, construction of offshore pipelines should be completed without any incidents. However, in the real world, and for a variety of reasons, sections of a pipeline can sometimes become damaged or even flooded during the laying process. Such an occurrence of unplanned flooding of the pipeline is known as “wet-buckling”. Since a pipeline is most likely to buckle during deepwater installation, it is important to have detection and correction methods in place at this stage.

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Plugging System for National Grid LNG Tank
By: iNPIPE Products
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    When iNPIPE were approached by National Grid they were challenged to find the safest and most time efficient manner to change a valve on a LNG storage tank situated at Partington. Safety was stressed as being of paramount importance as the LNG tanks held temperatures of minus 160°C.
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